Most visitors to Buenos Aires divide their time between Palermo and the center, meaning plenty of bus and taxi rides along busy Cordoba avenue. Looking out the window, there's a building that always catches the eye: the striking Palacio de las Aguas Corrientes (Palace of Running Water.)
Covered in decorative glazed tiles, the massive turn-of-the-century structure was originally the headquarters of the city's water company, containing a dozen giant tanks used to pump water all over the metropolis.
Enjoy the view from outside, or, if you're a real history buff, check out the small but fascinating waterworks museum inside, housing a quirky lineup of old-fashioned sinks and urinals.